What should I do if a prohibition symbol appears when installing a USB disk on a Mac?

What should I do if a prohibited symbol appears when installing a mac on a USB disk?

U disk installation MAC OS X system and the computer itself cannot be integrated.

Other situations:

The first situation:

A blue screen appears after starting Windows. When starting the Mac OS X installation, a prohibition symbol appears? There is a slash in the circle. , it is probably disabled or the disk is full.

After inserting the recovery disk, use Disk Utility to change the disk of the Apple system and then go back and try to install the system.

After startup, use Disk Utility to erase the disk first.

The version of the boot disk is too low.

Second case:

After booting the original U disk, enter Disk Utility, re-partition a partition, the EFI and GUID partition tables will be automatically rebuilt, and then reinstall mac os x, win7 The partition is still handed over to bootcamp under mac os x, and all data on the hard disk needs to be sacrificed.

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